LXR uboot/include/linux/time.h

   1#ifndef _LINUX_TIME_H
   2#define _LINUX_TIME_H
   3
   4#include <linux/types.h>
   5
   6#define _DEFUN(a,b,c) a(c)
   7#define _CONST const
   8#define _AND ,
   9
  10#define _REENT_ONLY
  11
  12#define SECSPERMIN      60L
  13#define MINSPERHOUR     60L
  14#define HOURSPERDAY     24L
  15#define SECSPERHOUR     (SECSPERMIN * MINSPERHOUR)
  16#define SECSPERDAY      (SECSPERHOUR * HOURSPERDAY)
  17#define DAYSPERWEEK     7
  18#define MONSPERYEAR     12
  19
  20#define YEAR_BASE       1900
  21#define EPOCH_YEAR      1970
  22#define EPOCH_WDAY      4
  23
  24#define isleap(y) ((((y) % 4) == 0 && ((y) % 100) != 0) || ((y) % 400) == 0)
  25
  26
  27/* Used by other time functions.  */
  28struct tm {
  29    int tm_sec;                   /* Seconds.     [0-60] (1 leap second) */
  30    int tm_min;                   /* Minutes.     [0-59] */
  31    int tm_hour;                  /* Hours.       [0-23] */
  32    int tm_mday;                  /* Day.         [1-31] */
  33    int tm_mon;                   /* Month.       [0-11] */
  34    int tm_year;                  /* Year - 1900.  */
  35    int tm_wday;                  /* Day of week. [0-6] */
  36    int tm_yday;                  /* Days in year.[0-365] */
  37    int tm_isdst;                 /* DST.         [-1/0/1]*/
  38
  39# ifdef __USE_BSD
  40    long int tm_gmtoff;           /* Seconds east of UTC.  */
  41    __const char *tm_zone;        /* Timezone abbreviation.  */
  42# else
  43    long int __tm_gmtoff;         /* Seconds east of UTC.  */
  44    __const char *__tm_zone;      /* Timezone abbreviation.  */
  45# endif
  46};
  47
  48static inline char *
  49_DEFUN (asctime_r, (tim_p, result),
  50        _CONST struct tm *tim_p _AND
  51        char *result)
  52{
  53    static _CONST char day_name[7][3] = {
  54        "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"
  55    };
  56    static _CONST char mon_name[12][3] = {
  57        "Jan", "Feb", "Mar", "Apr", "May", "Jun",
  58        "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
  59    };
  60
  61    sprintf (result, "%.3s %.3s %.2d %.2d:%.2d:%.2d %d\n",
  62            day_name[tim_p->tm_wday],
  63            mon_name[tim_p->tm_mon],
  64            tim_p->tm_mday, tim_p->tm_hour, tim_p->tm_min,
  65            tim_p->tm_sec, 1900 + tim_p->tm_year);
  66    return result;
  67}
  68
  69static inline struct tm *
  70_DEFUN (localtime_r, (tim_p, res),
  71        _CONST time_t * tim_p _AND
  72        struct tm *res)
  73{
  74    static _CONST int mon_lengths[2][MONSPERYEAR] = {
  75      {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31},
  76      {31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31}
  77    } ;
  78
  79    static _CONST int year_lengths[2] = {
  80      365,
  81      366
  82    } ;
  83
  84    long days, rem;
  85    int y;
  86    int yleap;
  87    _CONST int *ip;
  88
  89    days = ((long) *tim_p) / SECSPERDAY;
  90    rem = ((long) *tim_p) % SECSPERDAY;
  91    while (rem < 0)
  92    {
  93        rem += SECSPERDAY;
  94        --days;
  95    }
  96    while (rem >= SECSPERDAY)
  97    {
  98        rem -= SECSPERDAY;
  99        ++days;
 100    }
 101
 102    /* compute hour, min, and sec */
 103    res->tm_hour = (int) (rem / SECSPERHOUR);
 104    rem %= SECSPERHOUR;
 105    res->tm_min = (int) (rem / SECSPERMIN);
 106    res->tm_sec = (int) (rem % SECSPERMIN);
 107
 108    /* compute day of week */
 109    if ((res->tm_wday = ((EPOCH_WDAY + days) % DAYSPERWEEK)) < 0)
 110        res->tm_wday += DAYSPERWEEK;
 111
 112    /* compute year & day of year */
 113    y = EPOCH_YEAR;
 114    if (days >= 0)
 115    {
 116        for (;;)
 117        {
 118            yleap = isleap(y);
 119            if (days < year_lengths[yleap])
 120                break;
 121            y++;
 122            days -= year_lengths[yleap];
 123        }
 124    }
 125    else
 126    {
 127        do
 128        {
 129            --y;
 130            yleap = isleap(y);
 131            days += year_lengths[yleap];
 132        } while (days < 0);
 133    }
 134
 135    res->tm_year = y - YEAR_BASE;
 136    res->tm_yday = days;
 137    ip = mon_lengths[yleap];
 138    for (res->tm_mon = 0; days >= ip[res->tm_mon]; ++res->tm_mon)
 139        days -= ip[res->tm_mon];
 140    res->tm_mday = days + 1;
 141
 142    /* set daylight saving time flag */
 143    res->tm_isdst = -1;
 144
 145    return (res);
 146}
 147
 148static inline char *
 149_DEFUN (ctime_r, (tim_p, result),
 150        _CONST time_t * tim_p _AND
 151        char * result)
 152
 153{
 154    struct tm tm;
 155    return asctime_r (localtime_r (tim_p, &tm), result);
 156}
 157
 158#endif
 159